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Extraction and chemical characterization of humic acid from nitric acid treated lignite and bituminous coal samples. Sustainability, 13 Long Y, Ajmal M, Lu W, Zhao J. (2023b). Unlocking the potential of humic acid production through oxygen-assisted 145098
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0183;Preparing humic acids is considered to be an economic choice for the utilization of lignite. Herein regenerated humic acids (RHAs) have been obtained by means of hydrolysis of Chinese-aged lignite with NaOH as the catalyst. It has been verified that the hydrothermal process has enabled 67% increase in the extraction yield of humic acids (HAs).&سؤال
0183;humic acids (HA and RHA) decomposed to BPCA, low molecular weight acids, and carbon dioxide4. Several methods for the production of humic acids or derivatives from coal were studied, including dry air oxidation5,6 and nitric acid oxidation’. Another method[سؤال
0183;Left over coal from fungal extracted humic acid samples showed decreased carbon, hydrogen and sulphur content compared to left over coal from chemically extracted humic acid (Table 4). Table 3. Chemical analysis of Thar lignite. that the type of culture media and its chemical composition significantly affect the mycelial growth rate and[سؤال
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In this paper, the production of humic substances (HS) through the bacterial solubilization of low rank coal (LRC) was evaluated. In vitro depolymerization of coal humic acids by a crude preparations of manganese peroxidase from the white rot fungus Nematoloma frowardii b19. Appl Microbiol Biothecnol. 1997;47(5):566–571.
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0183;Despite numerous theoretical studies and confirmed positive results in this area, there are no industrial technologies for the production of humic fertilizers of a sufficient level of development. The overwhelming majority of preparations based on humic acids have an active ingredient concentration of no more than 2–3%.[سؤال
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Sodium salts humic acids is the sodium salt of humic acids, humic acid adopts natural weathered coal, brown coal and mud coal containing humic acids to refine and form through chemistry, it is multi-functional macromolecular compound, contains hydroxyl, quinonyl, the active group that carboxyl etc. are more, there is very large internal surface area, have stronger absorption,
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0183;3.1 Characterizations of raw coal and isolated coal-derived humic acid. The physico-chemical properties of the raw coal and isolated humic is summarized in Table 1, which indicates the coal to be of low-ash and high-sulfur in nature.The surface morphology (SEM analysis) of the coal-derived humic acid is found to be not smooth, and flakes sheets are[سؤال
0183;The NF A was the carbon footprint of the crop production system per unit area (kg N-eq⋅ha −1), and the NF Y represented the NF of the crop per unit yield Effects of urea enhanced with different weathered coal-derived humic acid components on maize yield and fate of fertilizer nitrogen. J. Integr. Agric., 18 (2019)&سؤال
0183;Lignocellulose hydrothermal artificial humic acid production: Reaction parameters screening and investigation of model/real feedstock In the current global context, fossil fuels, notably coal and petroleum, (ϕ 25 mm, 0.8 μm pore diameter, Shanghai Xinya Purification Equipment Co. Ltd., China) prior to HPLC analysis. Chromatographic[سؤال
0183;State-owned coal mining company PT Bukit Asam (PTBA) is collaborating with the Gadjah Mada University (UGM) for research and development of low-calorie coal into humic acid. The development of innovations related to coal downstreaming is[سؤال
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The high organic carbon content in corn stalks (CS) and the rich nitrogen resources in sewage sludge (SS) render them ideal for the hydrothermal production of nitrogen-enriched hydrothermal humic acid (HHA). This study conducted co-hydrothermal humification experiments using varying ratios of CS to SS under two distinct mixing modes: 1) co-hydrothermal carbonization of CS
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the source of humic acid which is extracted may be a naturally occurring weathered lignite such as leonardite which is found most abundantly in the states of North Dakota, Montana, and Texas. This material contains up to about 86% humic acids on a moisture and ash-free basis. Artificially produced humic acids may be prepared by the air oxidation of coal in a fluid bed at
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0183;Five coal samples obtained from Chinese coal-producing areas were oxidized by hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>), and humic acids (HAs) were derived from original coal and its oxidizition samples. HAs were characterized by physical and chemical methods, between which was also comparison.[سؤال0183;Coal gangue (CG), one of the world’s largest industrial solid wastes produced during coal mining, is extremely difficult to be used owing to its combined contents of clay minerals and organic macromolecules. This study explored a novel process of degrading the harmful organic compounds in the CG into humic acid using a biological method characterized[سؤال
0183;Flue gas desulfurized gypsum (FGD gypsum), mainly originates from thermal power plants, smelters, and large-scale enterprise boilers. This article reviews the production in China and the latest beneficial utilizations of FGD gypsum. China is a large coal-consuming country and has always had serious SO 2 emissions. Therefore, the Chinese&سؤال
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Indragiri Hulu, December 17, 2024 - PT Bukit Asam Tbk (PTBA) collaborated with Universitas Gadjah Mada (UGM) conducted a research and development (R&D) program to convert low-calorific value coal into humic acid.. The launch of the humic acid prototype took place at IUP Peranap in Indragiri Hulu, Riau, on Thursday, December 12, 2024.
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separate the humic acid (precipitate) fraction. The yield of humic acid was 23.1%, according to eqn (1) shown in the ESI.† Table S3† shows the ultimate analysis of humic acids. 2.4 Instrumentation SEM and EDS (Quanta 250, FEI, Hillsboro, USA) were used to characterize the morphology of the raw coal and residue treated
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0183;Acid hydrothermal solution (pH 0) recycling for hydrothermal humic acid (HHA) production with adjusting pH value to 0. a) Extraction and chemical characterization of humic acid from nitric acid treated lignite and bituminous coal samples. Sustainability, 13 (16) (2021), p. 8969, 10.3390/su13168969.[سؤال
0183;The present work investigates the optimization of humic acids (HAs) production from lignite processing wastes using a developed mechanical agitated (MA) tank reactor based on the results of response surface methodology (RSM). Characterization of coal-based fulvic acid and the construction of a fulvic acid molecular model. RSC Adv., 10 (2020[سؤال
0183;The best results for humic acid production were obtained at the highest temperatures and after longer times. Lower-rank coals yielded the highest humic acid contentrations, but due to the severe loss %Humic acids (daf) 47.92 Coal P Coal E Coal B 7.70 7.56 5.74 32.18 20.81 10.57 32.24 27.81 30.41 27.88 43.82 53.28 61.36 72.49 75.38 5.20 4.31[سؤال
0183;“Currently, the equipment can produce 20 liters of wet humic compounds per day from 5 kg of feed coal,” he said. Professor Anggara is now advancing Gamahumat to the pilot project phase, with plans to fabricate production equipment in Yogyakarta this year.[سؤال
0183;One of our proposals is to utilize the Peranap coal for humic acid extraction,” he said. The team’s research found that each ton of Peranap coal extraction can yield 50 percent humic acid (500 kilograms), more than the team’s original aim of merely 20%. Furthermore, the calorific value of the coal also increased by 20 percent after[سؤال
0183;This could be due to the fact that humic acid is a naturally occurring polymeric organic compound which has the potential to increase growth, nutrient availability and yield (Sharif et. al., 2002[سؤال
0183;Humic acids derived from Chinese weathered coal were oxidized with hydrogen peroxide (H2O2) under various conditions, and their chemical composition and structure were examined. The raw material humic acids (HA) and oxidized humic acids (OHAs) were characterized by elemental analysis and ultraviolet visible (UV-Vis), Fourier transform infrared[سؤال
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Nitric acid is an effective material for production of humic acids. Nevertheless, it is an expensive item that renders the process unfavorable industrially. Study indicated that there was a possibility to reuse the nitric acid for oxidation however the resulting structures of humic acids was not studied. The ligninolytic enzymes of the coal
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0183;In this study, response surface methodology (RSM) was adopted to investigate the optimization of process conditions for extracting humic acid (HA) from coal, aiming to enhance the yield of humic acid. Additionally, UV–vis spectroscopy, FTIR, XRD, TG-DTG, CP/MAS13CNMR, XPS, and molecular fluorescence were utilized to examine the properties of[سؤال
0183;PTBA develops coal into humic acid. Tuesday, 21 January 2025; Login; Register; News Archive Products Job Gallery Tender Events Advertise Magazines GIS Regulations More PTBA develops coal into humic acid. Wednesday, December 18 2024 - 04:45PM WIB NPR to start production in late 2025[سؤال
0183;Abstract At present, non-fuel utilization as alternative chemical feedstocks becomes very important and significant for the efficient conversion of lignite. To reduce CO2 production, an oxy-cracking technique in weak alkaline aqueous was conducted to selectively depolymerize Xilinguole lignite (XL) into humic acid (HA) under mild condition in this paper.&سؤال
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group were studied as initial feed material. The yield of humic acids from lignites of the Kharanorsk deposit was rather low and varied from 6 % to 17 % for dry fuel with average of 11.7 %. The yield of free humic acids of the studied sample was (HA)f = 6.7 %. The yield of humic acids from lignite of the Kagnalas deposit was average (15 - 28 %
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